In Microsoft Dynamics AX, you can define policies or rules that your employees must follow when entering and submitting expense reports. Implementing expense policies can help you manage expenses effectively.

For example, you can set a policy that for New York City the hotel expense per night cannot exceed USD 250. If an employee submits an expense report in which the room rate exceeds this amount, the system will notify the user that they have exceeded the policy amount for the expense.

You can also set up a date range within which expense policies are in effect. For example, airline fares for flights between Denmark and New York City can be expensive during the peak holiday travel season. You can define a flight expense rule that restricts the cost of flights to New York City to a limit of DKK 5000 and you can specify that this rule be in effect between March 15th and September 15th.